StacksVerified U.S. regulatory reference

46 CFR §109.555

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The master or person in charge and the engineer in charge shall ensure that—
  1. (a)Steam pressure does not exceed that allowed by the certificate of inspection; and
  2. (b)The safety valves, once set, are not tampered with or made inoperative.